Hi! most likely that you may have a bad sensor or a vacuum leak by the engine. Start the ignition and safely check under the hood, check the engine from top to bottom and see or hear some unusual sound noise, you may also check infront of the rediator, sometimes the leak start there and it gets transfer to the AC compressor. best of luck.Glad to help.Ginskie.

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The first thing I would do is flush the cooling system with a quality flush. I would inspect the radiator for leaks and back wash it to remove built up dead bugs/dirt. I would make sure the fan was coming on and operating properly. I would inspect/change the thermostat. I would consider changing the water pump if the above does not work. While you are there change the hoses and serpentine belt.
Don't reuse the antifreeze, replace with new after a complete flush. Use the proper mix/type for your vehicle.

I recently did all of the above on 1995 Ford 4.6L because of overheating and found the parts were oem! The water pump had no fins left on the impeller and the thermostat was partly missing. Very neglected system and the antifreeze looked like sun tea. Yours may not be that bad but you never know.

Did you have red antifreeze prior to the flushing? Ford engines are generally aluminium and should be using blue antifreeze which is suitable for aluminium engine blocks! I think the antifreeze is reacting to the aluminium.....re flush and use blue!

It sounds like the water pump is ok, however If the fan is operating properly you may have a partially obstructed radiator. That can be cleaned and flushed to see if that helps. You will need to replace the antifreeze at that point.

Are u referring to the coolant,if so find where it is leaking,if u find out its a hose u can replace it.I suggest after u fix the leak to flush out your coolant system and use antifreeze when u re fill it.Fill it with half antifreeze and half water.

If the thermostat and pump have been replaced, it's most likely the radiator. They corrode after time. Try flushing the antifreeze (not just draining and refilling it, but flush the system with clear water.) Most auto stores, Walmart, etc. carry the flush kit for very little $$. Once it's flushed, refill the system with the correct ratio of antifreeze.

If the problem persists, then it's most likely gunk in the radiator. Auto shops can boil them clean.

Short of all of the above, overheating can also be caused by a cracked cylinder head. If it overheated too bad at any point, it can crack the head and will continue to overheat regularly. Check for antifreeze in the oil. If there "is" antifreeze or water in the oil, the head is most likely shot (and yes, it will still run that way).